. . . . . . is the first step of sewage treatment.

Measuring of $BOD$ in sewage water gives an estimation of . . . . . .

In sewage treatment,which of the following removes floating debris?

Sewage or municipal waste should not be directly passed into rivers,streams and other water bodies because
$I.$ it contains human excreta and other organic waste
$II.$ it contains a number of pathogenic microbes
Which of the statement given above is/are correct?

What is the full form of $STPs$?

What is the process of treating wastewater by municipalities in cities called?